The verb m"n produces the constant result m
for each cell to which it applies. The rank used
is 3 $&.|. n .
For example, if n=:2,the three ranks
are 2 2 2,and if n=: 2 3,
they are 3 2 3 .
A negative rank is complementary: m"(-r) y is equivalent
to m"(0>.(#$y)-r)"_ y .